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Subject: Re: [ANNOUNCEMENT] TEST: Cygwin 3.0.0-0.7
To: cygwin AT cygwin DOT com
References: <announce DOT 20190205151855 DOT GD16130 AT calimero DOT vinschen DOT de> <02da4eeb-fcce-b1bc-e6eb-68ff3ec0cf74 AT ssi-schaefer DOT com> <20190207182735 DOT GG13951 AT calimero DOT vinschen DOT de> <8a2f041f-f8f7-6e17-5d97-5a168440009b AT ssi-schaefer DOT com> <20190208113158 DOT GH13951 AT calimero DOT vinschen DOT de> <17e339bb-2115-bf22-7291-04215aab3150 AT ssi-schaefer DOT com> <20190208122126 DOT GM13951 AT calimero DOT vinschen DOT de> <20190208122338 DOT GN13951 AT calimero DOT vinschen DOT de> <b07e6ba2-0ce0-4662-7a02-bda6ce3b0108 AT ssi-schaefer DOT com> <20190208130635 DOT GO13951 AT calimero DOT vinschen DOT de> <20190208132807 DOT GP13951 AT calimero DOT vinschen DOT de>
From: Michael Haubenwallner <michael DOT haubenwallner AT ssi-schaefer DOT com>
Message-ID: <6b182191-b235-fcbb-5b25-66243950043c@ssi-schaefer.com>
Date: Fri, 8 Feb 2019 15:43:10 +0100
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On 2/8/19 2:28 PM, Corinna Vinschen wrote:
> On Feb  8 14:06, Corinna Vinschen wrote:
>> On Feb  8 13:52, Michael Haubenwallner wrote:
>>> On 2/8/19 1:23 PM, Corinna Vinschen wrote:
>>>> On Feb  8 13:21, Corinna Vinschen wrote:
>>>>> On Feb  8 12:51, Michael Haubenwallner wrote:
>>>>>>
>>>>>> For now it seems like there's an inconsistency with PIDs:
>>>>>> A first process PID 100, receives PID 101 from spawn(),
>>>>>> but in the new process getpid() returns 102:
>>>>>>
>>>>>> $ ./dospawn /bin/bash -c 'echo $$'
>>>>>> 12625
>>>>>> waitpid: pid 12624 status 0x0
>>>>>
>>>>> Oh, hmm.  If you call spawnve, rather than execve, a new child pid
>>>>> is generated in spawnve, rather than just keeping the callers pid.
>>>>>
>>>>> However, apparently the child invents its own pid in pinfo::thisproc
>>>>> after being spawned.  But actually this should only occur for forked
>>>>> processes aore processes started from non-Cygwin parents.
>>>>
>>>> Does that help, by any chance:
>>>> [nope]
>>>
>>> How should the child be informed at all about the new cygpid value generated in
>>> parent's child_info_spawn::worker() ?
>>
>> I just realized this myself.  The old method creating Cygwin pids just
>> fetched the pid from GetCurrentProcessId(), which was right for spawned
>> (but not execed) processes.  For the new pid we might have to give this
>> to the child via child_info_spawn.
> 
> This works for me, can you test this, too, please?

Looks good to me as well, I'm going to start my hours running use case now.

> 
> I pushed your forkable branch to master, btw.  Would you mind to do the
> honors in the ;rease notes at cygwin/release/3.0 and doc/new-features.xml?

Ok, just preparing the tests first. Thanks a lot!

/haubi/

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